If all you did was use an Action Replay with Pokemon Black, White, Black Version 2, or White Version 2 to make wild Pokemon shiny, you'll have no trouble using the PokeBank to import them into Pokemon X and Y.
Outside of Pokemon Go, Shiny Celebi will become unobtainable when Pokemon Bank closes - until that happens, here's how to get one.
Shiny Celebi was available via movie promotion event. Dexoys is the only one you gotta worry about shiny because it can on be shiny in original gen 3 carts. That being said, they arent closing bank down. This was already stated multiple times.
Shiny Deoxys is currently exclusive to Generation 3, which means it'll become unobtainable once Pokemon Bank closes.
Pokemon Bank is presumably closing soon, and several Shiny Pokemon will become completely unobtainable afterward.
Most people knew this would happen.
Here's what it can detect incompatible moves and abilites(i.e wondertomb) here's what it can't: hacked evs hacked shinies.that's what i tested so far i'm still doing test though.